Does Flex Still Work for Creating iOS Applications?

I know at one point there was a way to create mobile applications using Flex that could be packaged and run for iOS, is this still the case?  Also, if so, which versions of Flex work for creating iOS applications? Which version(s) of Xcode are compatible with it?  Which versions of iOS? How do I get this working for packing for iOS?  I believe I have Flash builder 4.5 or 4.6.

Thank you,

John